Gilliam Autism Rating Scale Psychometric Characteristics Investigation for Diagnosing People as Having Autism in the Iranian Community

It is important to make a well-timed diagnosis of autism, using valuable tools is one of the diagnosis ways. This study aims at investigating GARS-3 psychometric characteristics for the Iranian Community.

In terms of practical purpose and research proposal, the study is descriptive and of authentication type. The statistical population includes all 3 to 22 year-old people suffering from autism disorder among which 113 individuals were chosen as sample group, using systematic sampling. The data collected were analyzed by questionnaires of GARS-3 and 2, and also by using spss 23 software and statistical tests like internal correlation coefficient and Cronbach's alpha.

Results indicated that based on kappa coefficient GARS-3 has got needed translation accuracy. The scale time validity of more than 0/86 coefficient was significantly confirmed 0.01. The validity among correctors that was gained with internal reliability of more than 0/82 was significant in all subscales than those of social relation (p<0/01). It should also be noted that simultaneous validity of this scale with that of GARS-2 indicated the existence of this validity with regard to significant correlation coefficients (p<0/01).

With regard to achieved results, it can be said that GARS-3 enjoys desirable psychometric characteristics to be used in Iranian community, therefore, it is recommended to scientific centers of research as a reliable and valuable tool.